Professional Quality Psychrometric Calculator

Calculate Thermodynamic Properties of Moist (Humid) Air





 Thermodynamic Properties of Moist (Humid) Air

The site provides a feature rich, professional quality Psychrometric Calculator web application.

The HumidAirWeb application calculates 35 thermodynamic properties of humid (moist) air. It allows 21 different combinations of input variables to be used for calculations.

Input variables that can be used are:

  • Pressure
  • Dry bulb temperature
  • Wet bulb temperature
  • Dew point temperature
  • Relative humidity
  • Humidity ratio
  • Enthalpy
  • Entropy
  • Volume




 Used Formulations

The "Psychrometric Calculator" is based on the formulations developed by Hyland and Wexler. These formulations are approved by ASHRAE as documented in the 1997 ASHRAE Handbook "Fundamentals". Hyland and Wexler presented the equation of state in:

  • Formulations for the thermodynamic properties of the saturated phases of H2O from 173.15 K to 473.15 K, W. Hyland and A.Wexler, ASHRAE Transactions, 89(2A) 500-519, 1983.
  • Formulations for the thermodynamic properties of dry air from 173.15 K to 473.15 K, and of saturated moist air from 173.15 K to 372.15 K, at pressures to 5 MPa, R. W. Hyland and A. Wexler, ASHRAE Transactions, 89(2A) 520-535, 1983.




 Services

There are two packages available:
  • The Basic package is free and doesn't require registration.
  • For the Premium package, registration is valid for 5 months (150 days) and it will not be extended automatically. After 5 months if you wish to continue using the application you will have to register and create a new account again.

The Registration includes free technical support for the duration of the subscription.





Free

Basic Package

$0.00 Free

This is a free service.
Free Psychrometric Calculator online.

  • Calculate thermodynamic properties based on dry bulb temperature, relative humidity and pressure at 1 bar or 14.5 psi.
  • Save data to Excel,
    CSV or Open Office File Format.
This is a free service.
You don't need account for the Basic Package.

Premium Package

$29.95 (150 Days)

This is a 5 months subscription fee for using the HumidAir Web (Psychrometric Calculator) online.

  • No limitations for calculation of thermodynamic properties.
  • Heating / Cooling process calculations.
  • Mixing stream calculations.
  • Save data to Excel,
    CSV or Open Office File Format.




 User Settings

The following user settings, from the last session, are automatically restored:

  • Units
  • Theme
  • Setup Panel visibility
  • Output Panel visibility
  • Registered users can select a new option during Login process, to be automatically logged-in in the future




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